Ingersoll CS700

=Ingersoll CS700=

The CS700 (or CS712, OS711, Impregnable) is a lever lock made by Ingersoll Rand. It uses ten levers and a spring-biased sidebar as the primary locking mechanisms. Levers are interspersed to act with a double-bitted key. The CS700 does not use a traditional style lever fence arrangement, and the key resembles a pin-tumbler or wafer style key. The CS700 is easily identifiable by the squiggle shaped keyway that resembles a flattened "w".

Principles of operation
The CS700 uses ten nickel-silver levers that alternate bitting surface in the plug. Each lever uses it's own spring (similar to traditional lever locks) and pivots along a common rod located at 6 o'clock. There are four positions available for cuts on each lever, giving the CS700 a total of 1,048,576 (410) theoretical key differs. The only keying constraint is that a bitting depth cannot be repeated more than three times sequentially. This gives the CS700 840 differs per bitting surface, for a total of 705,600 (8402) real key differs. The CS700 can be master keyed using widened true gates (gates that accomodate adjacent bittings), or with multiple true gates on each lever.

Keys are double-sided and nonsymmetric. Each bitting area interfaces with five of the levers. Keys are stamped with an indirect key bitting code and require a security card before they can be duplicated.

Model variations
This lock comes in a variety of models, including traditional mortise and rim deadbolts. There are different padlock models based on the type of shackle protection used, but the internal locking mechanism is identical:


 * OS600: Fully exposed shackle, 6 lever version
 * OS711: Fully exposed shackle
 * CS712: Semi-exposed shackle
 * CS700: Closed shackle

Disassembly instructions

 * 1) Unlock the padlock with the correct key.
 * 2) Remove the retaining screw(s) from the shackle hole.
 * 3) Remove the plug from the padlock body.

Vulnerabilities
The CS700 may be vulnerable to one or more of the following:


 * Lockpicking
 * Impressioning
 * Decoding

Notes
 * The rubber ring around the plug helps dampen feedback from lockpicking tools.
 * The OS600 (six lever version) was the topic of the Non-Destructive Entry magazine article Ingersoll Picking Tutorial by John Naughton.